Dual phase whitening dentifrice

Abstract

A dual phase whitening oral care composition comprising a first phase comprising a bound peroxide in a substantially anhydrous carrier and a second phase comprising an abrasive and a tartar control system in an orally acceptably carrier. Methods of whitening a tooth surface are also provided.

1 . A dual phase whitening oral care composition, comprising: 
 a. a first phase comprising a whitening agent in a substantially anhydrous and orally acceptable carrier; and    b. a second phase comprising an abrasive and an anticalculus agent in an orally acceptable carrier;    wherein the first phase and the second phase are maintained separately from each other until dispensed.    
   
   
       2 . A dual phase whitening oral care composition according to  claim 1 , wherein the whitening agent is selected from the group consisting of bound peroxides and solid peroxides.  
   
   
       3 . A dual phase whitening oral care composition according to  claim 1 , wherein the whitening agent is selected from the sodium perborate, urea peroxide, sodium percarbonate, PVP-peroxide, and sodium chlorite.  
   
   
       4 . A dual phase whitening oral care composition according to  claim 1 , wherein the first phase comprises the whitening agent at a level of from about 0.1% to about 30% by weight of the first phase.  
   
   
       5 . A dual phase whitening oral care composition according to  claim 1 , wherein the water content of the first phase is less than about 10% by weight of the first phase.  
   
   
       6 . A dual phase whitening oral care composition according to  claim 1 , wherein the substantially anhydrous carrier comprises polymers and copolymers of PEG, ethylene oxide and propylene oxide.  
   
   
       7 . A dual phase whitening oral care composition according to  claim 1 , wherein the substantially anhydrous carrier further comprises at least one of a surfactant and a thickener selected from the group consisting of silicone fluids, fumed silica, polyethylene glycol, carbomers, and gums.  
   
   
       8 . A dual phase whitening oral care composition according to  claim 1 , wherein the first phase further comprises at least one agent selected from the group consisting of: peroxide, a fluoride providing agent, and mixtures thereof.  
   
   
       9 . A dual phase whitening oral care composition according to  claim 1 , wherein the second phase further comprises at least one agent selected from the group consisting of a pH adjusting agent, and a fluoride providing agent.  
   
   
       10 . A dual phase whitening oral care composition according to  claim 1 , wherein the abrasive of the second phase is a silica abrasive.  
   
   
       11 . A dual phase whitening oral care composition according to  claim 1 , wherein the anticalculus agent of the second phase is selected from the group consisting of: inorganic phosphate salts, inorganic polyphosphate salts, polymeric polycarboxylates, sequestering agents, and mixtures thereof.  
   
   
       12 . A dual phase whitening oral care composition according to  claim 1 , wherein the second phase further comprises a peroxide activator selected from the group consisting of transition metal catalysts, alkaline compounds, and combinations thereof.  
   
   
       13 . A method of whitening a tooth surface comprising: 
 a. providing a whitening oral care composition having a first phase comprising a peroxide whitening agent and a substantially anhydrous and orally acceptable carrier; and a second phase comprising an abrasive and an anticalculus system in an orally acceptable carrier, wherein the first phase and the second phase are separated from one another; and    b. contacting the first phase with the second phase; and    c. applying the first phase and the second phase to the tooth surface.    
   
   
       14 . A method of whitening a tooth surface according to  claim 13 , wherein the peroxide phase is a bound peroxide comprising a complex of hydrogen peroxide selected from the group consisting of poly-N-vinyl poly-2-pyrrolidone, poly-N-vinypoly-2-piperidone, poly-N-vinyl-poly-2-caprolactam, and mixtures thereof.  
   
   
       15 . A method of whitening a tooth surface according to  claim 13 , wherein the peroxide is selected from the group consisting of sodium perborate, urea peroxide, sodium percarbonate, and mixtures thereof.